Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2006-09-26
2006-09-26
Patidar, Jay M. (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S226000
Reexamination Certificate
active
07112961
ABSTRACT:
A method and apparatus are provided for measuring the thickness of a test object. The apparatus includes an eddy current sensor having first and second sensor heads. The sensor heads are positioned to have a predetermined gap therebetween for passage by at least a portion of the test object through the gap. The sensor heads make measurements at given sampling locations on the test object as the test object is moved through the gap. The apparatus also includes a position sensing mechanism to determine positions of the sampling locations on the test object. The apparatus also includes an evaluation circuit in communication with the eddy current sensor and to the position sensing mechanism for determining the thickness of the test object at the sampling locations.
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Chang Yu
Gu Yu Ping
Huston Joel
Lei Lawrence C.
Lu Siqing
Patidar Jay M.
Wilmer Cutler Pickering Hale & Dorr
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